Internal Error Detected bug in an extension! Hook ConfirmEditHooks::confirmEditMerged failed to return a value; should return true to continue hook processing or false to abort. Backtrace: #0 /usr/share/mediawiki/includes/EditPage.php(956): wfRunHooks('EditFilterMerge...', Array) #1 /usr/share/mediawiki/includes/EditPage.php(2483): EditPage->internalAttemptSave(false, false) #2 /usr/share/mediawiki/includes/EditPage.php(449): EditPage->attemptSave() #3 /usr/share/mediawiki/includes/EditPage.php(340): EditPage->edit() #4 /usr/share/mediawiki/includes/Wiki.php(510): EditPage->submit() #5 /usr/share/mediawiki/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest)) #6 /usr/share/mediawiki/index.php(116): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest)) #7 {main}